Tendon action of two-joint muscles : transfer of mechanical energy between joints during jumping, landing, and running

摘要: Abstract The amount of mechanical energy transferred by two-joint muscles between leg joints during squat vertical jumps, landings after jumping down from a height 0.5 m, and jogging were evaluated experimentally. experiments conducted on five healthy subjects (body height, 1.68–1.86 m; mass, 64–82 kg). coordinates the markers body ground reactions recorded optical methods force platform, respectively. By solving inverse problem dynamics for two-dimensional, four-link model with eight muscles, power developed joint (net muscular) moments each muscle determined. to was determined as result time integration difference at moment, total serving given joint. It shown that jump in push-off phase running, (rectus femoris gastrocnemius) transfer proximal distal ones. At landing shock-absorbing joints. maximum ones equal 178.6 ± 45.7 J (97.1 27.2% work done moment hip joint) jump. 18.6 4.2 (38.5 36.4% ankle landing. conclusion made one-joint links compensate deficiency production distribution through muscles. During phase, help extend transferring them part generated energy. dissipate body.